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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampTool.java @ 18364:ad3c2cacdd1a

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Remove StampProvider interface.
author Roland Schatz <roland.schatz@oracle.com>
date Thu, 13 Nov 2014 15:07:10 +0100
parents 98e60bdf6d05
children ca81508f2a19
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes.type;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.code.*;
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28 import com.oracle.graal.api.meta.*;
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29 import com.oracle.graal.compiler.common.type.*;
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30 import com.oracle.graal.nodes.*;
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31
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32 /**
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33 * Helper class that is used to keep all stamp-related operations in one place.
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34 */
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35 public class StampTool {
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36
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37 public static Stamp meet(Collection<? extends ValueNode> values) {
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38 Iterator<? extends ValueNode> iterator = values.iterator();
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39 if (iterator.hasNext()) {
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40 Stamp stamp = iterator.next().stamp();
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41 while (iterator.hasNext()) {
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42 stamp = stamp.meet(iterator.next().stamp());
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43 }
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44 return stamp;
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45 } else {
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46 return StampFactory.forVoid();
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47 }
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48 }
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49
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50 public static Stamp rightShift(Stamp value, Stamp shift) {
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51 if (value instanceof IntegerStamp && shift instanceof IntegerStamp) {
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52 return rightShift((IntegerStamp) value, (IntegerStamp) shift);
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53 }
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54 return value.illegal();
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55 }
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56
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57 public static Stamp rightShift(IntegerStamp value, IntegerStamp shift) {
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58 int bits = value.getBits();
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59 if (shift.lowerBound() == shift.upperBound()) {
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60 int extraBits = 64 - bits;
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61 long shiftMask = bits > 32 ? 0x3FL : 0x1FL;
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62 long shiftCount = shift.lowerBound() & shiftMask;
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63 long defaultMask = CodeUtil.mask(bits);
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64 // shifting back and forth performs sign extension
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65 long downMask = (value.downMask() << extraBits) >> (shiftCount + extraBits) & defaultMask;
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66 long upMask = (value.upMask() << extraBits) >> (shiftCount + extraBits) & defaultMask;
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67 return new IntegerStamp(bits, value.lowerBound() >> shiftCount, value.upperBound() >> shiftCount, downMask, upMask);
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68 }
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69 long mask = IntegerStamp.upMaskFor(bits, value.lowerBound(), value.upperBound());
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70 return IntegerStamp.stampForMask(bits, 0, mask);
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71 }
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72
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73 public static Stamp unsignedRightShift(Stamp value, Stamp shift) {
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74 if (value instanceof IntegerStamp && shift instanceof IntegerStamp) {
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75 return unsignedRightShift((IntegerStamp) value, (IntegerStamp) shift);
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76 }
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77 return value.illegal();
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78 }
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79
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80 public static Stamp unsignedRightShift(IntegerStamp value, IntegerStamp shift) {
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81 int bits = value.getBits();
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82 if (shift.lowerBound() == shift.upperBound()) {
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83 long shiftMask = bits > 32 ? 0x3FL : 0x1FL;
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84 long shiftCount = shift.lowerBound() & shiftMask;
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85 long downMask = value.downMask() >>> shiftCount;
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86 long upMask = value.upMask() >>> shiftCount;
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87 if (value.lowerBound() < 0) {
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88 return new IntegerStamp(bits, downMask, upMask, downMask, upMask);
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89 } else {
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90 return new IntegerStamp(bits, value.lowerBound() >>> shiftCount, value.upperBound() >>> shiftCount, downMask, upMask);
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91 }
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92 }
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93 long mask = IntegerStamp.upMaskFor(bits, value.lowerBound(), value.upperBound());
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94 return IntegerStamp.stampForMask(bits, 0, mask);
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95 }
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96
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97 public static Stamp leftShift(Stamp value, Stamp shift) {
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98 if (value instanceof IntegerStamp && shift instanceof IntegerStamp) {
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99 return leftShift((IntegerStamp) value, (IntegerStamp) shift);
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100 }
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101 return value.illegal();
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102 }
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103
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104 public static Stamp leftShift(IntegerStamp value, IntegerStamp shift) {
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105 int bits = value.getBits();
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106 long defaultMask = CodeUtil.mask(bits);
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107 if (value.upMask() == 0) {
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108 return value;
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109 }
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110 int shiftBits = bits > 32 ? 6 : 5;
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111 long shiftMask = bits > 32 ? 0x3FL : 0x1FL;
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112 if (shift.lowerBound() == shift.upperBound()) {
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113 int shiftAmount = (int) (shift.lowerBound() & shiftMask);
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114 if (shiftAmount == 0) {
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115 return value;
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116 }
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117 // the mask of bits that will be lost or shifted into the sign bit
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118 long removedBits = -1L << (bits - shiftAmount - 1);
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119 if ((value.lowerBound() & removedBits) == 0 && (value.upperBound() & removedBits) == 0) {
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120 // use a better stamp if neither lower nor upper bound can lose bits
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121 return new IntegerStamp(bits, value.lowerBound() << shiftAmount, value.upperBound() << shiftAmount, value.downMask() << shiftAmount, value.upMask() << shiftAmount);
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122 }
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123 }
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124 if ((shift.lowerBound() >>> shiftBits) == (shift.upperBound() >>> shiftBits)) {
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125 long downMask = defaultMask;
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126 long upMask = 0;
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127 for (long i = shift.lowerBound(); i <= shift.upperBound(); i++) {
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128 if (shift.contains(i)) {
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129 downMask &= value.downMask() << (i & shiftMask);
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130 upMask |= value.upMask() << (i & shiftMask);
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131 }
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d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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132 }
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88012c1750a0 Move bit logic nodes into the arithmetic node hierarchies.
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133 Stamp result = IntegerStamp.stampForMask(bits, downMask, upMask & defaultMask);
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134 return result;
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parents:
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135 }
13999
f2b300c6e621 Refactor Stamp hierarchy.
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136 return value.unrestricted();
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137 }
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parents: 6299
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138
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139 /**
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140 * Compute the stamp resulting from the unsigned comparison being true.
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141 *
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142 * @return null if it's can't be true or it nothing useful can be encoded.
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143 */
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144 public static Stamp unsignedCompare(Stamp stamp, Stamp stamp2) {
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145 IntegerStamp x = (IntegerStamp) stamp;
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146 IntegerStamp y = (IntegerStamp) stamp2;
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147 if (x == x.unrestricted() && y == y.unrestricted()) {
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148 // Don't know anything.
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149 return null;
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150 }
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151 // c <| n, where c is a constant and n is known to be positive.
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152 if (x.lowerBound() == x.upperBound()) {
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153 if (y.isPositive()) {
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154 if (x.lowerBound() == (1 << x.getBits()) - 1) {
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155 // Constant is MAX_VALUE which must fail.
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156 return null;
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157 }
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158 if (x.lowerBound() <= y.lowerBound()) {
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159 // Test will fail. Return illegalStamp instead?
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160 return null;
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161 }
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162 // If the test succeeds then this proves that n is at greater than c so the bounds
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163 // are [c+1..-n.upperBound)].
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164 return StampFactory.forInteger(x.getBits(), x.lowerBound() + 1, y.upperBound());
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165 }
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166 return null;
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diff changeset
167 }
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168 // n <| c, where c is a strictly positive constant
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diff changeset
169 if (y.lowerBound() == y.upperBound() && y.isStrictlyPositive()) {
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170 // The test proves that n is positive and less than c, [0..c-1]
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diff changeset
171 return StampFactory.forInteger(y.getBits(), 0, y.lowerBound() - 1);
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172 }
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173 return null;
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174 }
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175
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176 /**
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177 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} Object
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178 * value which is known to be always null.
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179 *
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180 * @param node the node to check
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181 * @return true if this node represents a legal object value which is known to be always null
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182 */
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183 public static boolean isObjectAlwaysNull(ValueNode node) {
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184 return isObjectAlwaysNull(node.stamp());
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185 }
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186
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187 /**
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188 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} Object
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189 * stamp whose values are known to be always null.
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190 *
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191 * @param stamp the stamp to check
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192 * @return true if this stamp represents a legal object stamp whose values are known to be
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193 * always null
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194 */
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195 public static boolean isObjectAlwaysNull(Stamp stamp) {
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196 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
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diff changeset
197 return ((AbstractObjectStamp) stamp).alwaysNull();
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198 }
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199 return false;
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200 }
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201
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diff changeset
202 /**
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203 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} Object
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204 * value which is known to never be null.
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parents: 15198
diff changeset
205 *
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diff changeset
206 * @param node the node to check
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207 * @return true if this node represents a legal object value which is known to never be null
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208 */
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diff changeset
209 public static boolean isObjectNonNull(ValueNode node) {
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diff changeset
210 return isObjectNonNull(node.stamp());
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diff changeset
211 }
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212
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diff changeset
213 /**
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214 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} Object
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215 * stamp whose values known to be always null.
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diff changeset
216 *
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diff changeset
217 * @param stamp the stamp to check
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diff changeset
218 * @return true if this stamp represents a legal object stamp whose values are known to be
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diff changeset
219 * always null
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220 */
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diff changeset
221 public static boolean isObjectNonNull(Stamp stamp) {
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diff changeset
222 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
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diff changeset
223 return ((AbstractObjectStamp) stamp).nonNull();
15260
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diff changeset
224 }
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225 return false;
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diff changeset
226 }
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227
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diff changeset
228 /**
15380
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diff changeset
229 * Returns the {@linkplain ResolvedJavaType Java type} this {@linkplain ValueNode} has if it is
15260
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diff changeset
230 * a {@linkplain Stamp#isLegal() legal} Object value.
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diff changeset
231 *
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diff changeset
232 * @param node the node to check
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diff changeset
233 * @return the Java type this value has if it is a legal Object type, null otherwise
15260
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diff changeset
234 */
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diff changeset
235 public static ResolvedJavaType typeOrNull(ValueNode node) {
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diff changeset
236 return typeOrNull(node.stamp());
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diff changeset
237 }
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238
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diff changeset
239 /**
15380
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diff changeset
240 * Returns the {@linkplain ResolvedJavaType Java type} this {@linkplain Stamp} has if it is a
15260
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diff changeset
241 * {@linkplain Stamp#isLegal() legal} Object stamp.
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Josef Eisl <josef.eisl@jku.at>
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diff changeset
242 *
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diff changeset
243 * @param stamp the stamp to check
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diff changeset
244 * @return the Java type this stamp has if it is a legal Object stamp, null otherwise
15260
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245 */
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diff changeset
246 public static ResolvedJavaType typeOrNull(Stamp stamp) {
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diff changeset
247 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
83433cf49019 Fix incorrect null check in oop compression.
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diff changeset
248 return ((AbstractObjectStamp) stamp).type();
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249 }
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250 return null;
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251 }
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252
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253 /**
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254 * Checks whether this {@link ValueNode} represents a {@linkplain Stamp#isLegal() legal} Object
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255 * value whose Java type is known exactly. If this method returns true then the
10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
256 * {@linkplain ResolvedJavaType Java type} returned by {@link #typeOrNull(ValueNode)} is the
10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
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257 * concrete dynamic/runtime Java type of this value.
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61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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258 *
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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259 * @param node the node to check
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10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
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260 * @return true if this node represents a legal object value whose Java type is known exactly
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Josef Eisl <josef.eisl@jku.at>
parents: 15198
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261 */
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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262 public static boolean isExactType(ValueNode node) {
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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263 return isExactType(node.stamp());
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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264 }
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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265
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
diff changeset
266 /**
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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267 * Checks whether this {@link Stamp} represents a {@linkplain Stamp#isLegal() legal} Object
15380
10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
268 * stamp whose {@linkplain ResolvedJavaType Java type} is known exactly. If this method returns
10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
269 * true then the Java type returned by {@link #typeOrNull(Stamp)} is the only concrete
10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
270 * dynamic/runtime Java type possible for values of this stamp.
15260
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
diff changeset
271 *
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
diff changeset
272 * @param stamp the stamp to check
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10c6705dbe9a StampTool: fix typo and change "java" to "Java"
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 15260
diff changeset
273 * @return true if this node represents a legal object stamp whose Java type is known exactly
15260
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
diff changeset
274 */
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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275 public static boolean isExactType(Stamp stamp) {
16003
83433cf49019 Fix incorrect null check in oop compression.
Roland Schatz <roland.schatz@oracle.com>
parents: 15791
diff changeset
276 if (stamp instanceof AbstractObjectStamp && stamp.isLegal()) {
83433cf49019 Fix incorrect null check in oop compression.
Roland Schatz <roland.schatz@oracle.com>
parents: 15791
diff changeset
277 return ((AbstractObjectStamp) stamp).isExactType();
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61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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278 }
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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279 return false;
61363577a184 Move static helpers from ObjectStamp to StampTool.
Josef Eisl <josef.eisl@jku.at>
parents: 15198
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280 }
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
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281 }